Safety-throttle for pneumatic tools.



o. c. wlNFl-ELD & c. F. HAYwoom SAFETY THROTTLE FUR PANEUMATC TOOLS.

APPLICATION FHTED FEB. 23. 1916.

Patented Eeb. 20,1917.

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OLLI C. VVINFELDA AND CLAUDE F. HANOOD, OF BOONE, IOWA.

SAFETY-THROTTLE FOR PNEUMATIC TOOLS.

To all whom t may concern:

Be it known that we, OLLI C. WINFIELD and CLAUDE F. qrxrwoon, citizens of the United States, residing at Boone, in the` county of Boone and State of Iowa, have invented new and useful improvements in Safety-rlhrottles for Pneumatic Tools, of which the following is a specification.

rlhis invention is an improved safety throttle for pneumatic tools and machines which will automatically close when the operator discontinues his grip thereon.

An object of this invent-ion is to provide an improved device of this character which is simple in construction, which is strong and durable and may be easily operated, is inexpensive to manufacture and quick and positive in its action.

A further object of this invention is to provide ports communicating with the pneumatic tool or machine and with the supply, with means tor connecting the ports when in operation and which will be automatically cut olf when out of operati on.

The invention consists in the construction, combination, and arrangement of dv vices, hereinafter described andclaimed.

ln the accompanying drawing` Figure 1 is partly an elevation and partly a longitudinal sectional view of an automatic safety throttle constructed and arranged in accordance with our invention.

Fig. 2 is a transverse sectional view of the same with the ports opened.

Fig. 3 is a similar' view with the ports closed.

Fig. 4 is a'transverse sectional. view of the same on a plane disclosing the stop slot of the sleeve and the stop stud of the handle member.

Fig. 5 is a detail elevation of the sleeve with a portion of the grip jacket removed.

In the embodiment of the invention, we provide a handle member 1 which is cylindrical in form, is provided with longitudinal bores 2, 3, which extend from opposite ends and the inner ends of which are spaced apart and provided respectively with radial ports 4, 5. At one end of the member 1 is a threaded nipple G for the attachment of a pipe, leading to a pneumatic machine or tool and at the other end of said member 1 is a threaded nipple 7 for the attachment of an end member 8, said end member having a bore 3. to form au extension of the Specification of Letters Patent. Pgatgngdffeb, 20, 1917, Application filed February 23, 1916. Serial No. 80,000. v l i bore 3 and being internally threaded as at 9 for the attachment of an air supply pipe.

The member 1 has a diametrically reduced portion 10 providing an annular shoulder 11 at one end, the inner endof the end member 8 forming another shoulder, and on said reduced portion is arranged a sleeve valve 12 for partial rotation, said sleeve valve being provided with channels or slots 13 which when the sleeve valve is in one position, as shown in Figs. 1 and 2, establish communication between the ports el, 5, and hence between the air supply and the pneumatic machine or tool, and when said sleeve valve is in the position shown. in Fig. 3, it serves to cut off communication between the ports 4f, 5, the sleeve valve being mounted for partial rotation on the reduced portion 10 of the member 1. A handle grip jacket llis secured on and covers the sleeve valve and is provided with a roughened orV milled outer surface as shown. A spring 15 is provided which acts to normally hold the sleeve valve in closed position. Said spring is here shown as a coil spring with one end attached to the member 1 as at 16, and the other end 17 attached to a ring 1S through which the stud 7 passes and which ring 18 is attached to the sleeve valve.

So long as the sleeve valve is held by the operator in open position, the pneumatic tool or machine will be operated. l/Vhen the operator releases his grip of the .sleeve valve, the spring 15 immediately turns the same to closed position, and holds the sleeve valve in closed position, thus discontinuing the operation of the tool or machine.

To limit the turning movement of the sleeve valve, the same is provided with a segmental slot 19 and the reduced portion of the handle member 1 is provided with a stop studI 20 wiich operates in said slot.

Having described the invention, what is claimed is: Y

ln a device of the class described, a member having a reduced cylindrical portion and also provided with yspaced bores for Vconnection respectively to a source of motive fluid and to a tool or machine and radial ports leading 'trom said bores, said member also having a, threaded nipple at one end, a sleeve valve mounted for partial rotation on the reduced cylindrical portion of said member and having a channel les adapted to connect said ports, said sleeve Vadso having a ring at one end spaced 'from the shoulder formed around the opposing end of said membei1 b y said threaded nipple, a Spring in Said space and connected at one end 'to said member and at the other end to Said ring, said sp1-ing serving to normally turn the sleeve Valve to dosed p0- siton, and an end member screwed on Vthe threaded nipple, bearing against the outer end of the sleeve' valve and its ring and having a bore forming an extension of' one 0f the bores of said member. r

n testimony whereof we a'x our signutures in presence of two Witnesses.

OLLI G. VVINFIELD. CLAUDE F. HAYVVOD. tnesses A. W. NORDSTROM, XVM. J. SHANK.

Copies of this patent may be obtained for T11/'e cents each, by addressing the Commissioner 01E-Patents,

Washington, D. C. 

